drm/i915: Save the old CDCLK atomic state

[mirror_ubuntu-bionic-kernel.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d879129e43f47160755b5fd48f3b5ea877bd1062..326c63b153133c863dec1c83068bb7ffe9f9fb80 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6770,9 +6770,21 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
        start = (void *)PAGE_ALIGN((unsigned long)start);
        end = (void *)((unsigned long)end & PAGE_MASK);
        for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
+               struct page *page = virt_to_page(pos);
+               void *direct_map_addr;
+
+               /*
+                * 'direct_map_addr' might be different from 'pos'
+                * because some architectures' virt_to_page()
+                * work with aliases.  Getting the direct map
+                * address ensures that we get a _writeable_
+                * alias for the memset().
+                */
+               direct_map_addr = page_address(page);
                if ((unsigned int)poison <= 0xFF)
-                       memset(pos, poison, PAGE_SIZE);
-               free_reserved_page(virt_to_page(pos));
+                       memset(direct_map_addr, poison, PAGE_SIZE);
+
+               free_reserved_page(page);
        }
 
        if (pages && s)